XPOWER AP-2000 Air Purifier System HEPA-300-WB Stage 3 HEPA FilterXPOWER Stage 3 HEPA Filter for XPOWER AP 2000 Air Purifier System Compatible with the XPOWER AP 2000 Portable HEPA Air Filtration Systems, this 12 inch. thick Professional HEPA Filter captures contaminants such as bacteria, allergens, mold, and even 0. 3 sized sub micron particles at a rate of 99. 97%. Several pre filter Air Scrubber stages ensure the long life of this filter. Replace as needed when the indicator light illuminates and other filters